Vehicle air brake



Dec. 9, 1930. F. a.. HoRsPooL VEHICLE AIR BRAKE Shams-Sheet Filed Oct.26, 1928 Patented Dec. 9, 1930 FRANCIS LEROY HOBSPOOL, F SALT LAKE CITY,TLH

VEHICLE AIB BRAKE i Application fled ctobcr 26, 1828. Serial Io.315,193.

This invention relates to a vehicle air brake and lever brake combinedin one brake, and one of its objects is to provide a vehicle brake thatcan be operated by air and by a lever as well.

.Another object of this invention is to provide an air brake withexpanding jaws to be operated by a hand lever when vthe air is not used.

l0 Another object of this invention is to provide an' air brake withexpanding aws having cylinders thereon in which pistons are placed to'move brake shoes against a brake drum and having means within said jawsthrough which air passes to said cylinders.

Another object of this invention is to provide an air brake that willequalize the braking power on all brake shoes at the same tune. Anotherobject of this invention is to provide an air brake that when the air isapplied to set the brakes the expanding jaws now in use are dispensedwith.

With these and other objects in view the vinvention consists of certainnovel features of construction as hereinafter described and claimed.

lIn the accompanying drawing forming a part of this specification and inwhich corresponding parts are denoted by like reference characters, isillustrated the referred form of embodiment of the inventlon capable ofcarrying the same into practical operation, it being understood that theinvention is not necessarily limited thereto, as various changes in itsshape, proportions and general assemblage of its parts may be resortedto without departing from the princi les of the invention or sacrificingany of its a vantages, and the right is therefore reserved for Inakingall the changes and modifications which will fairly fall within thescope of the invention.

This application contains some features of my application bearing dateof October 13, 1928.

Referring to the drawing:

Figure 1 is a front' view of the invention showing it after the wheelhas been removed showing brake drum B in cross section.

5.0 Fig. 2 is a view on line 2-2 Fig. 1.

Fig. 3 is a face view of one of the expandiner jaws with the abutments24 removed.

ig. 4 is a side view of Fig. 3.

Fig 5 is a bottom view of one of the brake shoes-showing the rib 20thereon.

Fig. 6 is a view of one of the springs 25.

The invention will be described as applied to a back wheel of a vehicle,while'it also can be applied to the front wheels.

The reference character A denotes the back wheel of the vehicle to whicha brake drum B is attached. C denotes the collar in which is placed ballbearings for supporting the v shaft D.v E' denotes v the anchor 'plateby which the invention is secured to the vehicle F.

The invention comprises incombination with the vehicle wheel, abrakedrum B secured to the wheel. A brake plate 5 the periphery thereofhaving a flange 6 thereon under which the flange of the brake drumtravels. The center of the brake plate 5 is cut out in such a manner tofit around the collar C. On the face of the brake plate are abut-mentsor lugs 14 which may be integral therewith or spot welded thereon.

Pivotally placed on the brake plate 5 are expanding jaws 9 and 10 whichrest u on the abutments 14. The jaws are pivote to the brake plate bybolts 11 passing through lugs 33 and are movable on the face of thebrake plate and are secured thereon by bolts 12 and 13 passing throughslots in lugs 31 and 32. The brake plate is secured to the vehicle byrivets 7 which pass through the anchor plate E.

On the face of each jaw are v a pluralit of pockets forming cylinders15v into whic is placed pistons 16. Each piston has packing 18 thereon'for making said pistons air tight within their cylinders.

The outer end of each piston has a T shaped slot 19 thereon into whichis placedthe T shaped rib 20 o n the brake shoe 21.

Each of the cylinders has notches 22 therein in alinement with slot 19to allow the brake shoe 21 to move freely over the outer end of thepistons and cylinders when the rib 20 is placed into the notches andslot.

On-the back of each expanding jaw is a boss 34 having an aperturetherein into which will cause all the pistons to be moved outward at theSametime thus giving an even braking power to all parts of the wheel.

The cylindersare connected by a rib 39 which forms the back wall of thecylinders. The rib has the same radius as theouter face of the brakeshoes 21. To the rib are secured abutments 23 and 24. The abutments 23and,V

24 have a rightV angular projection thereoni by which they are securedto lange 39. The abutment 23 is angular in cross-section and theabutment 24 is rectangular in cross section. i

v Under each vabutment isplaced a spring 25 the ends thereof rest oneach end of the rib of the brake shoes. The end abutments 24 have anotch 26 therein to allow the spring to pass by each end thereof andconnect the brake shoes in such ya manner that the spring 25 will notinterfere with the movement of the jaws 9 and 10.

The springs 25 when placed under the abutment 23 have two forks on eachend thereof and when placed under abutment 24 one out side fork isremoved so the springs may be put into place before the brake shoe isplaced over the cylinder.

Placed between the upper end of the expanding jaws 9 and 10 is a jawexpander 27 the shaft 28 thereof passing through the .brake plate 5 andhaving a lever 29 secured thereto. The lever 29 is secured to brake rod30.

A slotted aperture 38 is placed through the lbrake plate 5 in alinementwith the boss 34 position.

Having described,v the parts of the invention, I will now illustrate theoperation of the same.

To set the brake air is applied through pipe 35 to port 36 to eachcylinder with the effect as stated above. When air is released fronithelbrake cylinders springs 25 move'brakeshoes and pistons to an unsetposition. During the operation of setting the brake by air\the jaws restupon the abutmentsTIi-j-jandfbolts 11, 12 and 13.

When theinventio is used as an emergency brake rod 30 is moved whichinturn moves lever 29 and then moving the jaw expander 27 to expand thejaws thus mov- I claim as new and desire tosecure by Letters Patent, is:

1. In avehicle air brake comprising an emergency brake, a brake platesecured to the vehicle, expanding brake jaws to be operated on saidbrake plate, cylinders extending from each of said jaws, each of saidcylinders having a piston therein brake shoes placed on the outer end ofsaid pistons, means for securing said brake shoes to said pistons, saidjaws having an air port therein through which air passesto each of saidcylinders to o erate said pistonsv so they will place said rake shoesagainst a brake drum.

2. In a vehicle air brake comprising a vbrake drum secured to a vehiclewheel, a

brake plate for said drum secured to a vehicle, expanding jaws mountedon said brake plate within said drum, said expanding jaws iavingcylindersprojecting therefrom, each of said cylinders havin? a piston`therein, a brake. shoe on each o said pistons, each of said expandingjaws having an air rt therein through which air passes to eac of saidcylinders for moving the istons out ward so they will move said againstsaid brake drum, means for rctuiiir.- ing s aid brake shoes and pistonsto an unset position when said brake is released, means for expandingsaid jaws when air is not` used for. settin the brake' and means forreturning said jaws to an unset position.

3. In a vehicle air brake, comprisin a brake drum secured to a vehiclewhee, a brake plate for said drum, said brake plate being secured to avehicle, expanding jaws mounted on said brake plate within said brakedrum, a plurality of pistons on each of said jaws, said pistons restingin cylinders on said expanding jaws, each of said jaws having an airport therein connecting each of said cylinders through which air passesinto said cylinders for operating sai'd pistons, means for supplyin airto said air its neVV

port, brake shoes operated y said pistons when air is applied to said clinders, means for expanding said jaws or setting the brake when air isnot used and means for' maintaining said brake shoes and expanding jawsin an unset position.

4. In a vehicle air brake, comprising aA a brake drum secured to avehicle whee brake plate secured to a vehicle, expanding jaws attachedto said brake plate, a pluralityders for pistons, each of said cylindersbe-I ing connected by an air passage within eachof said jaws, means forsupplying air to said air passage in each of said jaws for each of saidcylinders. to operate said pistons, a brake shoe operated by each ofsaid pistons, means for securing said brake shoes to said pistons, meansfor expanding said jaws for setting the brake when air is not used,means for returning said jaws to an unset position and means forreturning said brake shoes and pistons to an unset position when saidbrake is released.

5. In a vehicle air brake, comprisin a brake drum secured to a vehiclewhee, a brake plate for said drum, said brake plate being secured to avehicle, expanding jaws mounted on said brake plate within said brakedrum, a plurality of brake'shoes carried by said expanding jaws, airmeans carried by said expanding jaws for moving said brake shoes againstsaid brake drum, means for expanding said jaws for setting the brakewhen air is not used and means for maintaining said brake shoesv andexpandin jaws in an unset osition.

lgRANCIS LEROY ORSPOOL.

